atomic weight

noun

Definition of atomic weight 

: the mass of one atom of an element specifically : the average mass of an atom of an element as it occurs in nature that is expressed in atomic mass units — see Chemical Elements Table

First Known Use of atomic weight

1819, in the meaning defined above

Keep scrolling for more

Learn More about atomic weight

Share atomic weight

Statistics for atomic weight

Look-up Popularity

Time Traveler for atomic weight

The first known use of atomic weight was in 1819

See more words from the same year

Keep scrolling for more

More Definitions for atomic weight

atomic weight

noun

Medical Definition of atomic weight 

: the mass of one atom of an element specifically : the average mass of an atom of an element as it occurs in nature that is expressed in atomic mass units — see Chemical Elements Table

More from Merriam-Webster on atomic weight

Britannica.com: Encyclopedia article about atomic weight

Comments on atomic weight

What made you want to look up atomic weight? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

a state of commotion or excitement

Get Word of the Day daily email!

Test Your Vocabulary

Words from Greek and Roman Mythology Quiz

  • the-triumph-of-venus-by-alessandro-magnasco
  • Boreal comes from the name of the ancient Greek god of which wind?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!